Source: Black, S. (2019).
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Andisols / Andosol, Caldera, Earthquake, Eruption, Geomorphology, Lahar, Lava, Magma, Pelean eruption, Plinian eruption, Shield volcano, Stratovolcano / Composite volcano, Strombolian eruption, Tephra, Tsunami, Volcano
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Volcanism resulting from two different plate boundaries. 1) Convergent tectonic plate boundary, where oceanic crust is being subducted beneath another plate; 2) Divergent plate boundary where basaltic magma wells up into the spreading centre to create a ridge.
Composite volcanoes (or stratovolcanoes) are generally located along subduction zones, which are plate boundaries where one plate (usually composed of denser, oceanic crust) slides under the other (usually lighter continental crust). As the plate is subducted it takes with it some ocean sediments and water. As the subducting crust heats up these components enter the overlying mantle, helping to melt part of it and form magma that rises up to the surface forming a chain of volcanoes, known as a volcanic arc. The resulting magma is generally dioritic in composition and feeds andesitic (composite) volcanoes. Where plates are diverging (spreading apart) the solid molten mantle material, poor in silica and therefore basaltic in composition, begins to melt due to lower pressure, and wells up in the space between the plates. The result is a chain of volcanoes that produce Icelandic-style eruptions along the fissure.
Source: Geoscience Australia. (2018). Roach I & Bear-Crozier A (Eds.). Volcanoes Teacher notes and student activities (p. 21). Retrieved from https://ecat.ga.gov.au/geonetwork/srv/eng/catalog. search#/metadata/100760
Australia has a chain of extinct volcanoes along the east coast formed between 16-35 million years (Ma) ago.
Source: Geoscience Australia. (2018). Roach I & Bear-Crozier A (Eds.). Volcanoes Teacher notes and student activities (p. 24). Retrieved from https://ecat.ga.gov.au/geonetwork/srv/eng/catalog. search#/metadata/100760
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Volcanoes -